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Phosphorus (P)

Phosphorus (P) is element 15 of the periodic table, a nonmetal in period 3 and group 15. Its standard atomic weight is 30.973761998, so one mole of phosphorus atoms has a mass of 30.973761998 g. At room temperature it is a solid; it melts at 44.15 °C and boils at 280.5 °C.

15 P Phosphorus 30.973761998

Period 3, group 15 · Nonmetal

← Si Silicon S Sulfur →

Atomic number	15
Symbol	P
Standard atomic weight	30.973761998
Molar mass	30.973761998 g/mol
Category	Nonmetal
Group	15
Period	3
Block	p-block
Electron configuration	[Ne] 3s² 3p³
Oxidation states	+5, +3, −3
Electronegativity (Pauling)	2.19
Atomic radius (van der Waals)	180 pm
First ionisation energy	10.487 eV (1011.8 kJ/mol)
Electron affinity	0.746 eV
State at room temperature	Solid
Melting point	317.3 K (44.15 °C)
Boiling point	553.65 K (280.5 °C)
Density	1.82 g/cm³
Discovered	1669

Group 15

N · Nitrogen As · Arsenic Sb · Antimony Bi · Bismuth Mc · Moscovium

Calculate with Phosphorus

Molar mass of P Balance an equation Grams, moles and particles Whole periodic table

Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.